Help Please Re Morris Minor 1000 1968.
Simon Tudor
straightforward problem and any help advice would be greatly appreciated.
I recently ran out of petrol, which I have done before, (I know this is not
good in a 33 year old car) with few problems, certainly nothing that a
little bit of Redex in the carburettor and a good blast on the throttle
didn't sort out, and appeared not to suffer any ill side effects from this
last time.
Later that same day the car began to misfire and splutter a little.
When I went to start the car the next day it started fine but after
approximately 30secs cut out.
This is now the situation each time I start the car.
I have tried the Redex approach again, in the fuel tank and carburettor and
have had limited success, even managing to drive the car round the block a
few times, but eventually it cuts out and leaves me with the same problem.
I have disconnected the fuel pipe from the pump to the carburettor and there
is plenty of fuel getting through so it would appear the pump is fine, which
would suggest something amiss in the carburettor? The problem is I drive
cars but know very little about what goes on under the bonnet.
Can anybody please suggest a remedy. I have a Haynes manual.
Thanks in advance.
S.T.
Phil the anorak
The quick fix? Get the car running and give the top of the float chamber a
quick sideways tap with a screwdriver. It could be some muck has been drawn
up from the tank, and got stuck in the float chamber. You could undo the 3
screws which hold the float chamber top on and have a look for any muck in
the bottom of the float chamber.
30 seconds use sounds like the amount you would get out of one float chamber
full of petrol!
I never thought owning a mini was so useful...
--
Phil "the anorak" Howard
Reliant Scimitar GTE 3.0 V6 1972
Reliant Scimitar SS1 1600 Turbo hot snot machine
Which requires more maintenance? Windows 98 or a 30 year old car?
philhoward.at.ukonline.co.uk
Mike
Very likely you have some dirt blocking the main needle valve that
control how much fuel enters the float chamber. On the older SU carbs
(I'm presuming you have an HS4), the float chamber is a seaparate
entity, bolted onto the side of the carb. This is the part the fuel
pipe connects to. On the top will be three screws (blade type, no
pozidrive etc.) Undo these carefully and lift off the top of the
float chamber. The float/needle valve is attached to the top, and
pivots on a small pin that you can gently remove with a small pair of
pliers. The float and needle valve should then be able to be removed
and inspected. A blast of air through the valve seat and *out* of the
fuel inlet should clear and muck.
Check in the bottom of the float chamber for sediment, there's bound
to be some, and clear it out as much as possible. Reassembly, as they
say, is the reverse process of dissasembly! A *small* ammount of
gaskey sealant on the float chamber gasket is a good idea to prevent
leaks.
Consider fitting an inline fuel filter (available from any motor
factors) to prevent any further contamination entering the carb.
Mike
Andy Hewitt
<snipped text>
> Can anybody please suggest a remedy. I have a Haynes manual.
It sounds like you may have sucked up some crud into the carb float
needle. If you feel able, remove the carb (should be an SU), and take
apart the bottom, and remove the float needle valve, check it for
sticking or any obstructions. Don't stick anything metal into the hole
though, as you could damage the valve seat.
--
** Andy Hewitt ** FAF#1 'It's better burn out, than fade away'
Mac G3/400, Diversion 600s, Trekky, Honda Concerto EX
*Web page update - 02/01* http://homepage.ntlworld.com/ahewitt/index.htm
J.L.E
news:963ft6$4ic$1...@newsg2.svr.pol.co.uk...
> The above car is not too well at the moment, although I think it is
a very
> straightforward problem and any help advice would be greatly
appreciated.
Might be better to post to the < news:uk.rec.cars.classic > group (if
you have access) in future about your car, they tend to have more
knowledge about the older car, but anyhow ....
>
> I recently ran out of petrol, <snip>
>
> When I went to start the car the next day it started fine but after
> approximately 30secs cut out.
> This is now the situation each time I start the car.
>
<snip>
>
> I have disconnected the fuel pipe from the pump to the carburettor
and there
> is plenty of fuel getting through so it would appear the pump is
fine, which
> would suggest something amiss in the carburettor? The problem is I
drive
> cars but know very little about what goes on under the bonnet.
>
> Can anybody please suggest a remedy. I have a Haynes manual.
>
Sounds like the carburettor's float valve may be partially blocked,
the Haynes manual should have more than enough info to sort this. Just
make sure that you don't damage the gasket between the two parts of
the float chamber, otherwise you might get a nasty petrol leak, not a
good idea right above the exhaust manifold........ :~((((
Good luck
Bob McKay
Sounds like water in the carb from your tank bottom. Empty the float chamber
and let it re-fill with fuel. SU jets rarely get seriously blocked.
Bob http://members.aol.com/rmckay4631/Index.html
Simon Tudor
The float chamber is filling with petrol nicely and I removed the jet needle
from the base of the carburettor. The petrol is flowing through the jet
assembly nicely so no blockage there?
There is a bit of muck lurking at the bottom of the float chamber which I
will try and get rid of.
A neighbour had a look and inspected the points which he said were basically
knackered, but the car had been running great. I'll change these anyway, who
knows!
At this point it started rainning heavly so I called it a day.
Thanks for all the suggestions, I'll let you know of any progress.
S.T.